類題 2 如右圖所示,P,Q,R是圓心為O之單位圓上的點,若
3
P(1,0),Q
坐標(x,y)=
解
PR = QR
,
5
--- < POQ = -QOR
令<POR=∠QOR=0
2040 = 3/2 sino = 1/²
,R(x,y),且PQ=QR,則R 之
= OP = r = 1
号
= COSA=
⇒ x = 00420 = 2 20 558-1
= 2x(+)-1-3元
=
巧
y = sinz0 = 24in 2040 = 2x
大
::
= 24
zę
R(x,y)
20
O
e (²/²/5, 1/1/2)
JP(1,0)*
VE > Ñ > "ONA. §-= ONNIPIK
$===~==
-17=
*@_=_=1=8NG?
arw+]7-=oph
O